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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c1a3131adc0beb0cca88cef34306031d1a2290680163f4575657c4e96091de8' 
  AND token = 'Ya9SKUMcv+r6nVHdlxLtPFwv4l2T4Wh3K3tyHa3aNqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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