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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '332be5318a2c855170c06d80e291d2617efa9a65002c199af9525df8591919dc' 
  AND token = 'M00pfG6tRjqVEvebwQaYw0m+55Ozyz3K4bv5dC228mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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