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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45cc02bae539cfcc3fb208c3c36f38a4e168ff800041acd81ec2353abd20f079' 
  AND token = '/E5yO9uP5zyNM2eMMch/O6e/I0dVyZC4I89aqFHQNUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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