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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '717a342b2ee016a5423a7331d8ab175b8766d3a2a591de3fd68c925f3a01c5c8' 
  AND token = 'WAeYJnAcU6+TZTejDoUzktyd/GE1fwLd1AnYZkVsf0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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