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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '251cd014e8de016f634fa8b03cf74c224dd4818d3e8fa7fcdd8d2c801a8c297b' 
  AND token = 'nvkoyBhxSoUojEmYww+oZtARaQYZWl8qAaSI++ICT0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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