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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60b523ad4b20a1560c15c6dc8790937b565e59b1c6b6bb7df6072518ae799c61' 
  AND token = 'qed+b6gmm/YwAhulYa4Uga+NSrBZ993tRGynyGS7zYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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