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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59ac7e1445dfcb7497da6bbbe62224f185d06931d55829bb6410ac1d313bd3ba' 
  AND token = 'mz0G07hb1ygxfNHCTt3Rw4srkVVbIvb+ogA5l/s5saw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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