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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f52c112b7066907d33775ef6cac10a49c76ab2f2afb3f231c04fbdf7bdadffc8' 
  AND token = 'TC0RbsmjXD3KD2F384N9CH+47PzuDD95XhvCg6M+WUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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