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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7154e6af55379307763081a4a02650dea8bedaad22a3904cb1665753ac6462f2' 
  AND token = 'HRGlgQxbsdv5riSe2SECXm2BP0Z+ox1BYcZUZFbup4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00273

JSON explain

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