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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec68cf298b4ecc3d4100730f71369250ba1f6b34fc619c2b5899aac2a2280f8e' 
  AND token = 'SoP7DhWymEls8enmYbWmYpl3pa+aEeSM0fsmuY3WB98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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