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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a467e9140ad40d7dbf0e4cddc1d7f3a938239ce34440a479892714773bd6a9e' 
  AND token = '4n58OmSztYlgiL1fuompRqmNTvRT/rJFidYaTYmQ3Zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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