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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a22a0fe4e0603f36195ba6db30fc5d539f1baefef440727a5e48920084caeeae' 
  AND token = 'UzTlchGXZEtq4sJWQdzqr4kST58ZXy8u3HwVPHk3ymU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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