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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b2320ff5078454e8f79dcd6b6f90fe00b0f4b77604504a6169ea8cf082630f3' 
  AND token = 'a9bk/fRcQmbCrlipV3MvaQx2miAfGtv9LyyZMXge/0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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