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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f06de2c40e29784cd712e794d2a7bf0f1f210e4148ebd8a2a39597ab312d660b' 
  AND token = 'YobwhHhPSezO3X6wy3FoDaZKe9y+Ig2uTvP3VXjLKk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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