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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d0a2a66041be3b9e8725f9240be1553d9d3f736847ed02b05c476027053e10c' 
  AND token = 'NfkONohME18odx7AAYk03wSIivl6cpx2qBRUei+MSbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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