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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '008b0f5b2cabb6f51c3c02d8502e8bd63d07b13dd6f567c3a62b4a5552108092' 
  AND token = '7/7/UkEJE7Aah7xAE6g8OY6wLTqWD8uhppGNXytCT9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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