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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be0f092f63f2df05a7e0958f34967487c6922fc51e004a36a2f17e0d2501d853' 
  AND token = 'iboRoE7RZgmMW7bNc0/kMa61q2mxIa/9c5GMR6zYDps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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