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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55ec6bbe993e2a7bb50e9defb613d03b393dc6c88426e0a5784bfa7e559f1032' 
  AND token = '7+IqAwSKAR6suE3Rqpn3FiROrn7r8ZeFLUTsWAb/Avs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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