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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '240d602c63be253f46840427a51d3e962bb6436e0291b3fd83eca55116dc9049' 
  AND token = '7HEcMQRBpyrysbI3zwSFBx1xi/l98XHGEzn3skI9cJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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