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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '369c9f3840fc6b6d59c2db0590d101fb3dd0953263f06fa29039ef0f17835c55' 
  AND token = 'JLi5fGQmOb55AwLLWFX6zIp1mOtcH5e/Fp8dZW3N+hA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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