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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b9070050809eaf7a1caf2147917ec1bca13cfb153fb42ba788eefab35dc2884' 
  AND token = 'lIgZCDxvTwEMn5H3sULDmKUAxEVTiQH34hTyLlhZ0lA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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