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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfe1d3096861a2bc0fb61a03c7f68c9ff1dfde6c7699b988de66c8b8e846c273' 
  AND token = 'I81PCj6esXmN7XvAGY6k0s1G7r3fEezYvovkoJy1E40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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