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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bf4a460263b914ba0526f8212c6aa0c3f760d157127633784373591e10d84ab' 
  AND token = 'SzHsqOwOOO0rjwxYNoV3Cfjo6f8bXni9OcWinAbFM/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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