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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '210f60ba8ca06b1188c15b384ca00a17ab8f4aa544d10ccdd0776a08f0588165' 
  AND token = '7X0tZ6ttxK/V8pVDbIUlM2Mji5rbCs1cxN2ltJ3fl7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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