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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4530e12be1ea62a7ee4798f7f320f455c78562db6ae0d3c091ee7bdf9d65270' 
  AND token = 'nxDTfQFe9/5s6Hugb8bueeGAl9N46014ruTL3donaOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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