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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bda8e7342c51a60b1b1c42a3cf5d672d186be875660b0e76cbcdea7aeb612e3' 
  AND token = '38N7NfEbqP2bRyfawHz6+LbMr1vuxHMANa+7UXSbcf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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