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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50cb34bd3ce9ecb74afa59d75c269a85d610950655ba2327c7b0a48d3eb09f34' 
  AND token = 'PldRJXiCEni0WIp14C0lyiv1s3seKyvQLgZ6TJBuOsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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