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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49c37a76757407ad7d14609a49b88622645da13a8e139e7867af4a851b42b0ef' 
  AND token = 'GHQAQTHe9YNL+FAblPI69Fh7KkIz05+X+yTPd0L+s3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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