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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20998ef8c776d13a27f5ab564ba17e294301b4bc3d9910aacc545e31eafbcb0d' 
  AND token = 'BO+7KgS0onGbBTU4xlo6W/y+4QRAwj2UexLbMmtUy9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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