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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc617f44b1626226afbd3b9a6c3e3b4cf5e27dfbb19cb0ea1fa918ce5e3df949' 
  AND token = 'EkBUwXOo7xy3mVjvCRjZS+hb+8zinMHxOdObFa6Gx6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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