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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f99fffa5efa115ae73c904f5b200e45bc5a0914ca1f278f0a39c8036d26ec4a' 
  AND token = 'c48+U5egMjtaCw885M33qC2uGVyLAbs6KnPL7dCyK/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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