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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ec56ffc3a9b6a57d397338b2c2b16a6d577318481d46baf5ec33b3840192705' 
  AND token = 'GHnkgJ+HoGJPwRpaK9d403x95TPgImHg3eG+LOI7Ifs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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