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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b961e694c46dc0a27943e9a80594f89776822671679a3e5f6a6e892023a7653f' 
  AND token = '1RXhKWyfJyI8XWVnSyBELRM/dkkXpG5mD+cEPSZKtkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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