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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49c389baa83bfaa3086e0f5e4b685df5973ea18cf055bd0e52914d4260ec64b4' 
  AND token = '3udsFtMm90HEgDkXeSjYkEXvY8t0ADxolbXowH1Gsto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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