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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c731a6a08de124925844d14a0100c275a17e1f856851f3eea6a49d821aa6a807' 
  AND token = 'nM6y9P8s/PXmJblzpI53fsEVBgxUYH8eVq3e0n7pwMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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