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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08b1508e0a0948ac66b83b29b97d05aed659dcc55523db7cabc226c6b20909a6' 
  AND token = 'KZFtc8n4vNIeqdOvZGQncFkJcJ1XUg8315d8bp6yII8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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