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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbcbaa526e1cbaf77dd52a4c6f58b9e8b3868e71bd3342fe3bc5af817f0f6aae' 
  AND token = 'qzNBMJbRs8ghebIxXao4rSVFgv93csW5thfBRflAXjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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