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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f97baa7235c7f583393b43ba256e610abfbd03daf4cfd4aa559df5045cd1f936' 
  AND token = '+qFs/rrHBUsefM6Jfr+RyRmu51SluCsFu5aBxMTJmek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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