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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f102a18f9ea383de5fb20927c7a36ed1593aa1b2b5d9e0e430eec042d8ca9f2' 
  AND token = 'b38pSe3XpbBC1tTaFzHIAsm1DVx3npXpeS9TBRfDZE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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