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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0918a3f3bface3eb01ac7c548116edbf69d03f55d240444688215df6fcd2cda8' 
  AND token = 'cpithmnL2kqzkY9JLtW4OITA54lQ6XNXCZkbXZ1r4sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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