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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad86dc7311bd72166c1da3828103c14e82ec99d6d011c136034f6c4269c9f1a0' 
  AND token = '1gcAb8LT1XWecxSp3rSLNKW4Ap0UkgZouljUG/+4H1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}