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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0230b1e63fcdb92c99f7c6db1d9e1833a59d058a7c85560a705fe1f5a7a2b61' 
  AND token = 'elEK3jP6s6lVilK24ohizW5PEeXRIGLw4p7mw1OFje0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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