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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dac10b50a7e4de5d99f07d656f2140b5c91ddb0f863dadfbd9226834b08f8b7a' 
  AND token = '05fpk/RxucwIRZ4Uc13/k/SQeqLd+gmXGFZLmFhfBkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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