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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4e8bcd6b45547ed77df44271e0515508c9a2b90da0209b0b5878a4f2b4fe926' 
  AND token = 'KTrYLHgPJR/h9sF514rfKjjL/wJG8DTrvWNirxtFSII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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