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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9baadabe6252fcb0fcec4de0cd6a2891ee74e3ef4c22ed7afa2d539dc434ef37' 
  AND token = 'tQcR/VqHmhQP3MZ1lJk4lAOAn2AP2vDkvUdLYzWJcYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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