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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8bfbef441201df5b1937eb9f10ec86655a5070fea5f4677c79c97cdeda26716' 
  AND token = 'zElEmhnzMiw+k9R/TtpkwtJNS3/3OY/4izhdpyBfrWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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