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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bc5ca1a4b9bee9e99bc53a992877ef6cd9858dfbbe640e8eb752426297fab76' 
  AND token = 'r7phKcnxxSCvwPgarH3wq+MpfnpvZrgUKln14LlcQkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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