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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b03bf565ea29e83206d6321d457938b122de6aa60cb80605459ce196216468f5' 
  AND token = 'j6hEQjR+jlV8/Z7a2Tb9pI0c0Bv/RLDsaW0ZOEgYu6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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