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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29dc39a8dc78e822581a9f26488837e7fbee74c5ab23c4d0470bc92dd9e003fa' 
  AND token = 'Q+ARedjTINmJcQ9pFMV6AYIo55d/RnlyNJuqXoJ44wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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