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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '612dbf70166d5ca8494d26b6aedc3cd6ccd476bb3581bb85f90ff9570601a7e6' 
  AND token = 'q/5u0fHXy2nmLOK+0LYW+5bA9lZV6x1b6ljZBvD7TjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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