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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a82798d4a5120558cea3136e7ef7ea9e56842c5fb015dae5443c44daa0f9766f' 
  AND token = 'WqpMAJiAJ7C3qXcq59M4wQwm6ukGs9/5rOUOsTf1txQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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