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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecb4cb5b0a08b32140514e21a962cc3e136c9282e1454b14d90482ae056013a7' 
  AND token = 'siSN7LXt+rjGs2H6nDUz/rQlF3e0MuTV4ew4wc9C6og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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