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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfe8fd2a0fc7d291b04892c7a95d7a57f5a7b6faaded775213d99b8fce228e14' 
  AND token = '7Ke05ro1JdSAPR3+9LptkXsuPaffjP97xNbSRQKAGs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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